<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>WEBGL probe</title>
    <style>
        html, body {
            margin: 0;
            padding: 0;
            background-color: #444444;
        }
        canvas {
            display: block;
            width: 800px;
            height: 600px;
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            border: rgba(255,255,255,0.3) 1px solid;
        }
    </style>
   
</head>
<body>
    <canvas id="canvas"></canvas>
    <script  src="index.js"></script>
</body>
</html>